Implemented serialui dll containing CommConfigDialog,
GetDefaultCommConfig and SetDefaultCommConfig.

diff --git a/configure b/configure
index 25880d3..349606f 100755
--- a/configure
+++ b/configure
@@ -6210,6 +6210,7 @@
 dlls/rasapi32/Makefile
 dlls/richedit/Makefile
 dlls/rpcrt4/Makefile
+dlls/serialui/Makefile
 dlls/setupapi/Makefile
 dlls/setupx/Makefile
 dlls/shell32/Makefile
@@ -6450,6 +6451,7 @@
 dlls/rasapi32/Makefile
 dlls/richedit/Makefile
 dlls/rpcrt4/Makefile
+dlls/serialui/Makefile
 dlls/setupapi/Makefile
 dlls/setupx/Makefile
 dlls/shell32/Makefile